Casing pulley



A. S. JONES CASING PULLEY NOV. 24

Filed June 1, 1923 Patented Nov. 24, 1925.

UNITED STATES PATENT OFFICE.

ALBERT S. JONES. OF C'rIATTANOOGA. TENNESSEE. ASSIGNOR TO LUCEY MANUFAC- TUBING CORPORATION. OF CHATTANOOGA. TENNESSEE. A CORPORATION OF TEN- NESSEE.

Application filed I June 1,

To all Ir/mm i1 I/Hlj/ concern:

lie it known that l. Alan-arr S. Jones, a citizen of the United States. residing at Chattanooga. in the county of Hamilton and State of 'lennessec. have invented certain new and use in] improvements in (lasing lulleys: and 1. do hereby declare the following to be a full. clear. and exact description of the same. reference beingi had to the accompanying drawings. forming part of this specification.

This invention relates to a casino pulley structure particularly of the type used in crown blocks for well drilling apparatus and has for its object the improvement of such structure. An important featureof the present invention is the provision of a floating bushing on the sheave or pulley in combination with means for effectively positioning the floating pulley with relation to the sheave. and the I-bearns which support the stationary shaft of the sheaves.

A further object of the present invention lies in the pro-vision of a loosely mounted. non-rotating thrust washer at each side of each pulley to prevent the sheaves from rubbing against the sides of the beams.

The crown block in its general form is quite similar to that described in the Vreeland Patent No. 1.368.775 r ated February 15, 1921. and is used for the. purpose dc.- scribed in that patent.

In the drawings.

Fig. 1 is a central section through the preferred form of my device.

Figs. 2 and 3 are similar views of slightly modified forms.

Each sheave has an annular oil chamber 30 closed by a plurality of plugs 31. preferably three or more in number so that one of the plugs will be. in such position as to render.

convenient the filling of the oil chamber 30 irrespective of the position in which the sheave comes to rest.

A bushing of steel is pressed in the sheave usually at from live to seven tons pressure elfectively preventing turning of the steel bushing in the sheave pulley and also pre venting oil from leaking out between the steel bushing and the. sheave. the steel hushing as shown in each of the figures being in free communication with the oil pocket or reservoir 30. Between the steel bushing pressed in the sheave and the shaft 18 (indieated in dotted lines in Figs. 1 and 2) is CASING PULLEY.

1923. Serial No. 642,816.

a floatingbushing 33 preferably of brass or bronze polished both on the inside and the outside and tilting the steel bushing and the shaftdoosely with sullicient clearance for a running tit.

A plurality of radial o'l holes 23 i are provided in the floating bushing: toconvey oil to the shaft '18 and find it convenient to position certain of the holes 3- 1- directly in the center line of the sheave while others are slightly to the left and to the right respect vely of such center line in order that flow of oil from the annular reservoir 30 and through a hole in a pressed-in bushing will not he interfered with as the floating bushing shifts from side to side within the limits permitted. In each of the modifications shown the floating bushing 33 is substantially similar but the means for centering the floating bushing on the sheave differs with each of the modifications.

Referring: particularly to Fig. 2 the steel pressed-in bushing is here shown in two sections numbered 36 and $37 each having at its outside edge an integral annular lip or flange 39 forming a stop inemlwrfor the floating bushing 33. in this modification the halves of the steel bushing are pressed into the sheave from opposite. sides and after assembling a number of radial holes 40 are drilled along the junction line to provide a flow of oil from the reservoir to the floating bushing.

In the modification shown in Fig. 3 the pressed-in steel bushing. here numbered 41. is of one piece slightly shorter axially than the sheave and a ring 42 also of steel is secured to the permanent bushing 41 at each side by means of screws 43 or other fastenings. In this'nmdilication the detachable ring 49. takes the place of the flange 48 be-- ing of the same size and for the same purpose.

In the modification. shown in Fig. '1 which is elected as the preferred form. although I find each of theseveral modifications of particular suitability under different circumstances, the steel pressed-in bushing. here numbered 45. is of slightly greater axial length than the body of the sheave and is provided at each side with an annular groove i6 into which is snapped a steel split ring 4L8 the resilience of which is such as to hold the ring firmly seated in the groove when the ends of the ring are released. The purpose ill) 0i' tl1is ring like the flun e 38 and the angle member 42 is to limii the axial movement of the flouting bushing.

\Vhat I claim is:

1. In a casing pulley structure a stationary shaft, :1 sheave rotatabljwmqunted thereon, a bushing pressed in said sheave, a floating bushing between said pressed-1n buslling and said shaft, and means carried by said pressed-in bushing for limiting axial move ment of said flouting bushing.

2. 1n a casing pulley structure, a stationary shaft, a sheave rotatably mounted thereon, a bushing pressed in said sheave n. floating bushing between said pressed-in bushing and said shaft, and detachable means carried by said pressed-in bushing for limiting axial movement of said floating bushing.

In a casing pulley structure, a stationary shaft, a sheave rotatably mounted thereon, a bushinmpressed in said sheave, a. floating bushing %etween said pressed-in bushing said said shaft, and an annular li extending inwardly from said pressed-in ushin at each side thereof for positioning said oating bushing.

ALBERT S. JONES. 

